Add It Up
235 + 124 = ?
359
456 - 123 = ?
333
Round 324 + 577 to the nearest hundred.
900
I had $75. I spent $32. How much do I have left?
$43
I am thinking of a number. Add 200 to me and you get 900. What number am I?
700
472 + 389 = ?
861
900 - 250 = ?
650
Estimate: 2,134 + 3,856 ≈ ?
About 6,000
Sarah read 248 pages in September and 325 in October. How many pages total?
573 pages
Subtract 300 from me and you get 2,500. What number am I?
2,800
2,347 + 1,556 = ?
3,903
602 - 385 = ?
217
Estimate: 6,992 - 3,003 ≈ ?
About 4,000
A school ordered 485 pencils. They used 263. How many are left?
222 pencils
My digits add up to 10. I’m between 400 and 500. What number could I be?
424, 433, 442, etc.
3,279 + 4,587 = ?
7,866
3,407 - 1,859 = ?
1,548
Which is the better estimate: 3,820 + 2,190 = 5,000 or 6,000?
6,000
Liam baked 120 cupcakes for a fundraiser. He sold 87 in the morning and 24 in the afternoon. How many are left?
9 cupcakes
If you add me to 1,234, you get 2,000. What number am I?
766
A farmer planted 3,412 trees last year and 2,785 this year. How many trees altogether?
6,197
A factory made 4,200 parts but only 3,178 passed inspection. How many failed?
1,022
Explain: Why is estimating useful before solving?
It helps check if your answer makes sense and catches mistakes.
A store sold 2,175 chocolate bars on Monday and 1,986 on Tuesday. How many more were sold Monday than Tuesday?
189 bars
I’m a 3-digit number. When you subtract 217 from me, you get 583. What number am I?
800